关于进化速度的问题现在必须解决：进化是逐步进行的，还是总在短时间内发生？
The question about the rate of evolution must now be turned around: does evolution ever proceed gradually, or does it always occur in short bursts?
步进电机的运转操控着走纸的速度，步进电机假如装置没有到位，同样会到致使走纸速度反常。
The operation of the stepper motor control the speed of paper, stepper motor if the device is not in place, the same will lead to abnormal paper speed.
步进电机受脉冲的控制，通过改变通电的顺序可改变电机的旋转方向，改变脉冲的频率可改变电机的旋转速度。
Step motor control, by pulse by changing the order of electricity can change the motor rotation direction, change the pulse frequency can change the motor rotation speed.
步进频率雷达中，目标的径向运动将导致合成的目标径向一维距离像产生距离徙动和波形失真，需要对目标速度进行估计以补偿其影响。
In stepped frequency radar, the velocity of targets must be estimated and compensated to eliminate the range migration and distortion due to target moving.
在步进梁速度电液比例控制系统中，比例变量泵是关键组成部分。
In the walking beams velocity electro-hydraulic control system, proportional variable pump is the key components.
在此基础上，介绍了小数分频器在直接数字频率合成技术和步进电机驱动速度控制中的两种常见应用。
Applications of decimal Fraction frequency divider in the area such as direct digital frequency synthesis technology and stepper motor drive speed controller a re introduced.
所建模型为步进电机的速度控制提供了理论依据。
The model provides an important theory foundation for the speed control of stepping motor.
详细说明了用BC D码拨盘开关控制步进电机步数和速度的方法及可编程序控制器编程软件实现脉冲分配器功能的方法。
It explicates the ways of stepping motor's stepping count and speed in the control of the BCD-code dial switch, and the function of pulse distribution with the programmable soft of PLC.
举例来说，步进电机需要输入一系列数字脉冲信号来控制电机的位置和速度。
For example, a stepper motor requires a series of digital pulses as an input to control the motor position and speed.
详细介绍霍尔速度传感器，里程计数脉冲的产生，步进电机的驱动和BL 2115集成电路在电子式车速里程表中的应用。
The Hall speed transducer, the generation of the mileage pulse, the driving of step motor and the application of integrated circuit of BL2115 in speedometer are introduced in detail.
先进的技术使用可使贴标机达到较高的速度、精确度及可靠性，包括步进电机、室内微处理器以及极可靠的电子元件。
Speed, accuracy and reliability are achieved through the use of advanced technology incorporating stepping motors, in house microprocessor development and ultra-reliable electronic components.
除目标速度以外，为毫米波频率步进雷达提供频率信号的频率源的色散特性也会对雷达分辨率造成恶化影响。
Apart from target velocity, the dispersion of frequency synthesizer providing signals to radar also deteriorates the performance of radar.
步进电机受脉冲的控制，通过改变通电的顺序可改变电机的旋转方向，改变脉冲的频率可改变电机的旋转速度。
Stepping motor control by pulse, by changing the order of power to change the direction of rotation motor, change the pulse frequency may change the motor rotation speed.
速度控制采用易控的步进电机外加微小误差转子；
The speed control uses easily to control step-by-steps the electrical machinery in addition light error rotor;
为解决以上不利因素，研究设计了一套步进电机细分驱动器来控制步进电机，用以改善步进电机运行性能和量化显示切割速度。
To settle the above problems, the research introduce a suite of subdividing driver to control step motor, the aim is to improve step motor running capability and quantify cutting velocity.
为补偿目标径向速度对频率步进雷达合成距离像的影响，提出了一种目标径向速度估计方法。
A new radial velocity estimation method was presented to compensate the effects of the targets radial velocity on range profiles synthesized from a stepped-frequency radar.
本文介绍了一种步进电机的锁相控制系统，为实现这一系统提出了步进电机速度误差阻尼方法，并给出了便于工程使用的设计方法。
A step motor phase locking control system and it's velocity error damping method is presented in this paper. A convenient method for engineering design is also given.
基于该方案，通过截用PC机系统的定时器资源产生精确定时的控制脉冲，使步进电机实现宽广范围内的速度平滑控制。
Based on this method, the accurate control pulses are generated from the PC timer and used for driving the step motor to realize a wide range speed control smoothly.
同时，结合相位编码步进频率信号形式提出在高速目标情况下实现精确速度测量的两步估计方法。
Simultaneously, the method implementing precise velocity estimation in two steps associative with PCSF signal characteristic under high moving targets is presented.
运动速度可采用恒速，也可以通过步进电机控制变速运动方式。
The speed can be constant or be changed by the controlling of step motor.
在下位机软件设计中介绍了串口通信程序设计、步进电机速度曲线的控制和数据采集程序设计。
The software design include the serial port communication program design, stepper motors velocity curve control and the data acquisition program design.
利用此套技术可对实时传输的加速度记录同步进行长周期基线校正、积分求速度及积分求位移。
By using this technique, the baseline of transmitting acceleration data in real time is adjusted, and the velocity and the displacement are integrated synchronistically.
本文介绍了ZK - 400真空注型机的原理及功能，并重点介绍了通过控制步进电机的脉冲频率达到调节真空注型机搅拌速度的目的。
The paper introduces the principle of ZK400 Vacuum RT Machines; from control pulse frequency of step-motor to adjust mixes speed of Vacuum RT Machines.
提出了步进电机的几种速度调节方法。
Several kinds of methods of speed regulation for stepper motor are presented in the paper.
进给速度可通过改变驱动脉冲的频率调节，机构在高频驱动大位移动作时亦表现出准确的步进特性，可用于小型机电系统的开环进给驱动。
The friction drive mechanism moves well even when driven at high frequency and with long strokes, so it can be used with open-loop control systems for micro displacement.
步进电机通过细分驱动模块可以以四种不同的步距驱动工作台移动，以实现显微镜对工作台移动速度的不同需要。
Step-motor can drives the worktable in 4 kinds of different step distance through the subdividing and driving module, realizes the worktable of microscope to move in different speed.
测速传感器选用步进电机测速形式，测速传感器向秤重仪表发出系列脉冲信号，每个脉冲代表皮带行程的一个单位，脉冲频率和皮带速度成正比。
Choose stepping motor speed sensor speed form, to speed sensor weighed instrument issued a series of pulses, Each pulse represents one of the units.
系统采用红外传感器检测液滴速度，用步进电机及其配套装置来控制液滴速度。
This system employed infrared sensors to detect liquid drops and used step motor with other parts to control the liquid speed.
频率步进合成高分辨雷达体制受目标径向运动速度的影响极大，为了获取目标准确的高分辨距离像，需要做运动补偿。
Target velocity has a big negative effect on synthetic high resolution range profiles of step frequency radar. In order to obtain precise profiles, velocity compensation is indispensable.
频率步进合成高分辨雷达体制受目标径向运动速度的影响极大，为了获取目标准确的高分辨距离像，需要做运动补偿。
Target velocity has a big negative effect on synthetic high resolution range profiles of step frequency radar. In order to obtain precise profiles, velocity compensation is indispensable.
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